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</a> The second law can be expressed in several ways, the simplest being that heat will naturally flow from a hotter to a colder body. At its heart is a property of thermodynamic systems called entropy 芒聙聯 in the equations above it is represented by "S" 芒聙聯 in loose terms, a measure of the amount of disorder within a system. This can be represented in many ways, for example in the arrangement of the molecules 芒聙聯 water molecules in an ice cube are more ordered than the same molecules after they have been heated into a gas. Whereas the water molecules were in a well-defined lattice in the ice cube, they float unpredictably in the gas. The entropy of the ice cube is, therefore, lower than that of the gas. Similarly, the entropy of a plate is higher when it is in pieces on the floor compared with when it is in one piece in the sink.
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